Abstract: A method for sensing damage of bearing of engine using a vibration signal may include separating a vibration signal of an engine sensed by a vibration sensor installed at one side of the engine of a vehicle into a vibration signal by combustion knocking and a vibration signal of a bearing installed between a crank pin and a connecting rod; extracting, by a signal processing filter, a signal of a predetermined natural frequency band from the vibration signal of the bearing; determining whether the vibration signal of the bearing is higher than a predetermined bearing damage threshold, in a predetermined engine state condition in order to sense breakage of the bearing during operation of the engine; and confirming that the bearing has been damaged.

Abstract: A method for detecting a damaged-bearing in an engine using a vibration signal may include: separating, by a controller, a vibration signal of the engine detected by a vibration detecting device installed on one side of the engine of a vehicle into a vibration signal caused by combustion knocking and a vibration signal generated in a bearing, extracting a signal in a predetermined natural frequency band from the vibration signal generated in the bearing using a band-pass filter, and processing the extracted signal to a quantified bearing signal using the controller, and comparing the quantified bearing signal with a preset damaged-bearing criterion using the controller to determine whether the quantified bearing signal is equal to or higher than the preset damaged-bearing criterion to determine a damage to the bearing.

Abstract: A method for sensing damage of bearing of engine using a vibration signal may include separating a vibration signal of an engine sensed by a vibration sensor installed at one side of the engine of a vehicle into a vibration signal by combustion knocking and a vibration signal of a bearing installed between a crank pin and a connecting rod; extracting, by a signal processing filter, a signal of a predetermined natural frequency band from the vibration signal of the bearing; determining whether the vibration signal of the bearing is higher than a predetermined bearing damage threshold, in a predetermined engine state condition in order to sense breakage of the bearing during operation of the engine; and confirming that the bearing has been damaged.

Abstract: A method for detecting a damaged-bearing in an engine using a vibration signal may include: separating, by a controller, a vibration signal of the engine detected by a vibration detecting device installed on one side of the engine of a vehicle into a vibration signal caused by combustion knocking and a vibration signal generated in a bearing, extracting a signal in a predetermined natural frequency band from the vibration signal generated in the bearing using a band-pass filter, and processing the extracted signal to a quantified bearing signal using the controller, and comparing the quantified bearing signal with a preset damaged-bearing criterion using the controller to determine whether the quantified bearing signal is equal to or higher than the preset damaged-bearing criterion to determine a damage to the bearing.